The whole area is flat and subject to constant flooding. Altitudes vary from 20 to 100 metres (66 to 328 ft). Average annual rainfall is 1,200 millimetres (47 in). Temperatures vary from 20 to 37 °C (68 to 99 °F) with an average of 25 °C (77 °F). Vegetation types are typical of the igapó, floodplain and land environments in Amazonia.[3] The bald uakari (cacajao calvus rubicundus) is protected in the station.[1] The station contains what may be the world's largest palm grove, with over 30,000 hectares (74,000 acres) of Mauritia flexuosa (buriti palm) trees growing in swamp conditions. The ecosystem is threatened by overfishing and illegal deforestation.[2]